气体火花开关电极烧蚀研究

发布时间：2018-01-05 19:13

本文关键词：气体火花开关电极烧蚀研究　出处：《强激光与粒子束》2014年01期 　论文类型：期刊论文

【摘要】：采用Mo,WCu和W分别作为三种气体火花开关的主电极材料,进行放电条件下电极烧蚀实验,研究开关电极烧蚀率和烧蚀形貌,分析电极烧蚀特征。结果表明,Mo,WCu和W开关的主电极烧蚀率分别为3.32×10-2 C-1·m-2,2.63×10-2 C-1·m-2和1.74×10-2 C-1·m-2,W开关主电极烧蚀率最小。实验后开关的主电极中心烧蚀严重,呈现明显裂纹和烧蚀坑。Mo主电极表面呈现明显熔融态,阴极表面形成大量裂纹(宽度达10μm)和孔隙(孔径达10μm);WCu和W主电极表面形成少量圆球状W突起(粒径达20μm及以上)。开关外壳内壁沉积了喷溅颗粒。WCu开关外壳沉积颗粒较大(粒径达10μm),Mo开关外壳沉积颗粒居中(粒径为2μm),W开关外壳沉积颗粒最小(近1μm)。因此可优先选用具有优异抗烧蚀性能的W作为气体火花开关电极材料。
[Abstract]:Mo-WCu and W were used as the main electrode materials of three kinds of gas spark switch respectively. The ablation rate and morphology of the switch electrode were studied under the condition of discharge. The results show that the main electrode ablation rate is 3.32 脳 10-2 C-1 路m-2 for Mo-Mo-WCu and W switches, respectively. The main electrode of 2.63 脳 10-2 C-1 路m-2 and 1.74 脳 10-2 C-1 路m-2W switch has the lowest ablation rate. After the experiment, the main electrode center of the switch is seriously ablated. There are obvious cracks and ablation pits on the surface of the main electrode. A large number of cracks (width up to 10 渭 m) and pores (pore size up to 10 渭 m) are formed on the cathode surface. A few spherical W protrusions (diameter 20 渭 m and above) were formed on the surface of WCu and W main electrode. The spatter particles were deposited on the inner wall of the switch shell. The deposited particles in the switch shell were larger (10 渭 m in diameter). The deposited particles of Mo switch shell are in the middle (the diameter is 2 渭 m) and the grain size of the switch shell is the smallest (about 1 渭 m). Therefore, W with excellent ablative resistance can be selected as the gas spark switch electrode material.
【作者单位】：中国工程物理研究院电子工程研究所;
【基金】：国防预研基金项目
【分类号】：TM564
【正文快照】： 气体火花开关(GSG)因具有结构坚固、开关电流大、工作电压高、可靠性高、寿命长和环境适应性强等优点,可作为高压脉冲开关广泛应用于多个领域,如高压脉冲发生器、航空引擎点火及高压设备、激光器和元器件防护等[1]。在工作过程中,气体火花开关导通时发生电极烧蚀,开关重复工

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